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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Informations [Table Text Block]
Supplemental cash flow information follows: 
 
Year Ended December 31,
Supplemental cash flow information
2012
 
2011
 
2010
Interest paid
$
2,683

 
$
3,882

 
$
2,174

Income taxes paid, net
11,131

 
2,137

 
7,509

Noncash transactions:
 

 
 

 
 

Debt issued for purchases of businesses
$
100

 
$
500

 
$
—

Detail of acquisitions:
 

 
 

 
 

Assets acquired:
 

 
 

 
 

Receivables
$
474

 
$
16

 
$
—

Operating supplies
209

 
—

 
—

Prepaid expense
47

 
—

 
112

Equipment
1,826

 
321

 
1,703

Deposits and other
—

 
—

 
1,549

Intangibles
3,812

 
1,190

 
3,588

Liabilities assumed
(1,868
)
 
(65
)
 
(1,116
)
Debt issued for purchases of businesses
(100
)
 
(500
)
 
—

Cash paid
$
4,400

 
$
962

 
$
5,836